Optimization Design Of Structure And Echnology For Composite Flywheel Rotating At A High Speed

Flywheel energy storage is an efficient, clean, environmental adaptability, energy storagemeans, which used high-speed rotation of flywheel rotor stored energy as the mode ofmechanical energy, and release of mechanical energy when needed to achieve the energyoutput. Now, flywheel energy storage has been used in many fields of aerospace, powerpeaking, automotive power compensation, etc.5kWh energy storage flywheel is generally used to provide energy on the satellite,lighthouse, automobiles and other facilities, so the size and weight cannot be too large, so thatthe rotor should be rotating at a higher speed. The line speed on the edge of the flywheel isvery high, the ordinary metals cannot afford such a large circumferential stress, so we choosecarbon fiber T700/epoxy composite which has a high longitudinal tensile modulus as the rimof flywheel, the material of hub is aluminum alloy7075. Radial compressive stress is notenough when flywheel rotating at a high speed, it may separate the hub and the rim, it causedthe flywheel failure, increase the radial strength of the flywheel can be prepared by two means.One is the use of the tension wound composite flywheel rotor and another is interference suitmethod using polycyclic.Given design requirements for the use and the stored energy of the flywheel structureand dimensions, which inner diameter of50mm, outer diameter of265mm. The total mass ofthe flywheel rotor is100kg, density of the energy storage is50Wh/kg, at rated speed29751rpm rated reservior energy5kWh. The stress-strain state of stationary and rotatingflywheel rotor design using finite element ANSYS software analysis, simulation flywheelnormal charging and discharging process nodal displacements and the contact surface of thecontact surface radial stress analysis, make the judgment whether the flywheel failure or not.Using the finite element method, the actual preparation conditions based on compositeflywheel rim. The amount of interference between the layers of the rim of the flywheel rotoroptimized using finite element analysis method to calculate the optimal amount ofinterference to optimize the amount of interference with the actual production combine to givethe most reasonable amount of interference; flywheel after setting optimal amount ofinterference, to tricyclic interference packages as an example, the rim is given to thecomposite material layer in three different hierarchical manner, compare flywheel rotates stress and displacement size analysis to obtain the optimal starslayer results. Then, by therotor imbalances accuracy level, provide the flywheel required correction centrifugalforce.Finally, modal analysis given the natural frequency of the flywheel and the first sevenvibration mode diagram, verify the security of the flywheel in the rated speed.